DISTRIBUTION OF CHILEAN JACK MACKEREL EGGS AND LARVAE IN THE SOUTHEASTERN PACIFIC OCEAN CHILEAN JACK MACKEREL WORKSHOP (CHJMWS)
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1 INSTITUTO DE INVESTIGACIÓN PESQUERA DISTRIBUTION OF CHILEAN JACK MACKEREL EGGS AND LARVAE IN THE SOUTHEASTERN PACIFIC OCEAN Sergio Núñez, Sebastián Vásquez, Patricia Ruiz & Aquiles Sepúlveda Instituto de CHILEAN JACK MACKEREL WORKSHOP (CHJMWS) Santiago, June 30 July 3th 2008
2 FAMILY : Carangidae SCIENTIFIC NAME : Trachurus murphyi (Nichols) COMMON NAME : jurel, jurelillo INTERNATIONAL NAME : Chilean Jack mackerel, Horse mackerel
3 BACKGROUND Instituto de Chilean jack mackerel (Trachurus murphyi) is a migrating pelagic species which inhabits the Southern Pacific Ocean, and constitutes the most important fishery for Chile. Exhibits a strong seasonal migration pattern: - an offshore migration towards the oceanic reproductive habitat in spring mainly located in oceanic waters off central Chile (32-40 S) and beyond 90 W. - an onshore migration during the late summer related to coastal food availability in coastal waters. During fall and winter, this species aggregates compact schools inside the Chilean EEZ, being more available for the Chilean purse-seine fleet. Spawning occurs mainly between October and December, although it can extend from September to February. In this contribution, we describe the spatial distribution of jack mackerel eggs and larvae for the , and we attempt to examine the relationships between early stages densities and environmental conditions during the spawning period in oceanic waters off central Chile.
4 DISTRIBUTION AND FISHERIES Instituto de CONCEPTUAL MODEL: Jack mackerel population is structured as: Juveniles (< 25 cm) NURSERY AREA SPAWNING AREA (Oct-Dec) FEEDING AREA (Mar-Jul) Adults (> 26 cm)
5 Instituto de ADMINISTRA TION INDUSTRY THIS STUDY COULD NOT HAVE BEEN POSSIBLE WITHOUT THE JOINT EFFORT OF THREE DIFFERENT ORGANIZATIONS: RESEARCH - THE GOVERNMENT OF CHILE (UNDERSECRETARIAT OF FISHERIES AND FISHERY RESEARCH FUND) WHO HAS PRIORITIZED A DECADE OF HIGH SEA STUDIES ON THE JACK MACKEREL SPAWNING REGION OFF CENTRAL CHILE. - THE LOCAL FISHING INDUSTRY, WHO PROVIDED 8-10 FISHING VESSELS FOR DEVELOPING CRUISES IN A HUGE SPAWNING REGION OFF CENTRAL CHILE. - THE SCIENTIFIC GROUP, LED BY THE FISHERY RESEARCH INSTITUTE (WITH THE PARTICIPATION OF IFOP, U. CONCEPCIÓN, U. CATHOLIC CONCEPCIÓN), WHICH HAS STUDIED THE DISTRIBUTION OF JACK MACKEREL EGGS AND LARVAE, AS WELL AS REPRODUCTIVE ASPECTS, BIOLOGICAL-FISHING DATA, ENVIRONMENTAL INFORMATION, SCHOOLS STRUCTURE, AND THE ASSESSMENT OF SPAWNING BIOMASS, AND THEIR INTERANNUAL VARIABILITY IN THE OCEANIC AREA OFF CENTRAL CHILE.
6 OBJECTIVES Instituto de To determine relative abundance indexes of jack mackerel eggs/larvae in the oceanic waters off central Chile, and to characterize the reproductive condition and the spawning area. QUESTIONS TO SOLVE Which is the main spawning region for jack mackerel stock? Which is the abundance of eggs/larvae in the oceanic waters off central Chile? Which is the behavior of Chilean jack mackerel reproductive schools in oceanic waters? It is possible to assess the spawning biomass with the DEPM?
7 SAMPLING DESIGN Instituto de ANNUAL CRUISES: Study period: Spawning peak (November) of Study area: 75-92ºW; 33-39ºS (1000 nm from the coast). Cruise period: 8-12 days. Number of stations: > 650. Fishing vessels: 5-10 vessels from the local purse-seine fleet. ICHTHYOPLANKTON SAMPLING: WP-2 nets (0.6 m, 303 µm mesh size) Vertical tows (100 m to surface) Stratified tows (100-75, 75-50, 50-25, 25-0 m) PHYSICAL FIELD: SST, wind, MSLA. Turbulence index, geostrophic currents.
8 STUDY AREA Instituto de
9 SAMPLING AND ANALYSIS Instituto de FOR EACH STATION: Analysis of total planktonic sample (separating and counting all eggs & larvae presents in samples). Identifying the jack mackerel eggs/larvae, as well as the other components of the ichthyoplanktonic assemblage. Determination of differents stages of jack mackerel eggs and larvae. Analysis of spatial distribution (geostatistical techniques). Analysis of association between eggs/larvae and environmental conditions (EOF, GAM, others). Fishing vessels Ichthioplancton sampling ENVIRONMENTAL CONDITIONS CTDO data Satelital information: SST (Pathfinder, Modis), Chlorophyll (Modis), Wind (QuikScat), Geostrophic velocities (AVISO).
10 SUMMARY OF CRUISES Instituto de
11 Instituto de ABUNDANCE INDEX FOR CHILEAN JACK MACKEREL EGGS n 1999-d Total Stations (+) Stations % 72,3 72,7 58,4 75,0 72,3 60,4 72,3 41,6 38,9 26,5 Mean Density(D) 317,9 561,7 266,3 444,2 640,2 132,0 373,5 98,4 111,3 39,8 Var(D) 1903,2 3618,6 400,9 413,9 1781,8 97,6 763,0 87,9 183,0 31,7 Mean Dpos 440,0 772,6 455,9 592,2 885,8 218,7 516,6 236,7 285,8 150,2 Var(Dpos) 3653,6 6550,4 1177,8 603,1 2956,0 222,6 1347,5 408,7 1046,8 311,8 Dpos(max) 3917, ,1 3501,4 5199, ,0 2900, ,4 4420,9 4633,2 1167,1
12 Instituto de ABUNDANCE INDEX FOR CHILEAN JACK MACKEREL LARVAE d Total Stations (+) Stations % 58,4 57,0 77,0 76,2 38,9 53,1 46,8 25,9 30,1 Mean Density(D) 243,0 152,0 265,9 242,5 49,9 97,6 87,0 37,0 65,1 Var(D) 1130,5 134,7 149,4 164,1 19,2 43,9 45,1 16,1 103,7 Men Dpos 416,2 266,5 345,2 318,2 128,4 183,9 185,8 142,7 216,2 Var(Dpos) 3330,5 415,0 211,3 234,7 89,8 122,9 155,9 166,5 904,4 Dpos(max) 2802,6 2157,4 3395,3 2864,8 1379,3 1697,7 2122,1 1379,3 2723,3
13 SPATIAL DISTRIBUTION OF EGGS. NOVEMBER High densities were reported between º S, and westward to 82-84º W, showing that the bulk of jack mackerel spawning occurs nm offshore. Since 2005, low densities were observed in the study area
14 SPATIAL DISTRIBUTION OF LARVAE. NOVEMBER Distributional pattern of larvae shows a east-west gradient with high concentrations confined in the western part of study area (>82ºW)
15 0-25 Huevos. 10m Huevos. 10m Instituto de Profundidad (m) y = e x R 2 = Profundidad (m) y = e x R 2 = EGGS NOV EGGS NOV Larvas. 10m 2 Larvas. 10m Profundidad (m) LARVAE NOV y = e x R 2 = Profundidad (m) y = e x R 2 = LARVAE NOV VERTICAL DISTRIBUTION OF CHILEAN JACK MACKEREL EGGS AND LARVAE
16 Instituto de JACK MACKEREL EGGS / LARVAE OFF NORTHERN REGION OF CHILE - Highest densities in winter and spring winter surveys covered 1,871 stations, 318 were positive for eggs (17%) and 166 for larvae (8.9%). - Average densities per total stations fluctuated between eggs/10m 2 and between 1 38 larvae/10m 2. - In this period, the jack mackerel eggs and larvae are concentrated mainly between 20 and 24 S and in the more oceanic sector of the study area.
17 ENVIRONMENTAL CONDITIONS IN THE SPAWNING AREA OFF CENTRAL CHILE
18 It has been suggested that spawning is confined to the Subtropical Convergence Zone (northern 40ºS) (Evseenko 1987). STF STF separates the warmer/saline subtropical waters from colder and less saline subantarctic waters. Spawning region shows a low variability associated to mesoscale structures. STF WWD (From Cheagneau & Pizarro, 2005)
19 T CHL W TURB CURR ENVIRONMENTAL CONDITIONS IN THE SPAWNING PERIOD OFF CENTRAL CHILE
20 CARACTERIZACIÓN AMBIENTAL DEL ÁREA DE DESOVE DE JUREL FRENTE A CHILE CENTRAL EVIDENCES OF PHYSICAL- BIOLOGICAL COUPLING
21 Instituto de SPATIAL DISTRIBUTION OF LARVAE AND THE OCEANIC SPAWNING ENVIRONMENT. EXAMPLE FOR NOV LARVAE & SST LARVAE & WIND LARVAE & TURBULENCE INDEX LARVAE & CURRENTS
22 JACK MACKEREL LARVAE & MESOSCALE EDDIES Instituto de Example for ºS band
23 ENVIRONMENTAL RANGES FOR EGGS/LARVAE DENSITY OF CHILEAN JACK MACKEREL IN THE SPAWNING AREA OFF CENTRAL CHILE Instituto de Example for Nov 2006 SST TURBULENCE WIND SST GRADIENTS Range % Range % Range % Range % 12,1-13,0 0, ,84 0,0-1,5 32,42 0-0,035 24,87 13,1-14,0 4, ,61 1,6-2,5 35,64 0,036-0,07 27,04 14,1-15,0 9, ,22 2,6-3,5 8,60 0,071-0,105 14,66 15,1-16,0 43, ,53 3,6-4,5 4,42 0,106-0,140 18,36 16,1-17,0 29, ,32 4,6-6,0 5,22 0,141-0,175 6,99 17,1-18,0 2, ,35 6,1-9,0 9,60 0,176-0,22 2,53 SST TURBULENCE WIND SST GRADIENTS Range % Range % Range % Range % 12,1-13,0 0, ,18 0,0-1,5 52,36 0-0,035 22,01 13,1-14,0 0, ,21 1,6-2,5 24,43 0,036-0,07 28,54 14,1-15,0 6, ,90 2,6-3,5 5,44 0,071-0,105 26,72 15,1-16,0 42, ,18 3,6-4,5 1,09 0,106-0,140 11,0 16,1-17,0 43, ,69 4,6-6,0 3,02 0,141-0,175 7,26 17,1-18,0 2, ,63 6,1-9,0 7,13 0,176-0,22 3,39
24 GAM ANALYSIS Instituto de Eggs GAM plots for jack mackerel eggs and larvae considers pooled data. Dome-shaped relationship between eggs density and latitude reveal a max density at 35ºS. Results show that the spawning zone extends beyond the western limit considered in this study. Larvae High eggs concentrations were associated to SST higher than 16ºC, wind speeds lower than 6 knots and low values of turbulence. Time series shows two peaks of egg densities in 1999 and 2004 evidencing a lower abundance in the last years. For jack mackerel larvae, it is shown high densities at 34ºS and 85ºW, associated with warmer waters (18-19ºC), wind speeds between 4-6 knots and low turbulence values.
25 CONCLUSIONS Instituto de 1.- The high incidence of positive stations (>70%), reveals that the bulk of jack mackerel spawning occurs in oceanic waters off central Chile, between S, and westward 82ºW. Several nucleus of high density of eggs/larvae were found farther offshore than 84ºW extending beyond 90ºW. Abundance of eggs and larvae revealed an important east-west gradient, and interannual variability. 2.- Higher eggs/larvae density were associated to warmer waters (16-19 ºC), moderate winds (4-8 m s -1 ), low currents (< 15 cm s -1 ) and turbulence, as well as SST gradients (< 0.3 ºC 10 km -1 ). 3.- Statistical analysis reveals a significant relationship (p<0.05) between eggs/larvae density and both SST and wind magnitude. Other analysis as habitat-species association, and spatial EOF coupling eggs and environmental data (not shown here), confirm the statistical analysis and suggest a bio-physical coupling among these variables in the jack mackerel spawning area. 4.- The spawning area located in the oceanic waters off central Chile (33-40ºS) constitutes an important region for spawning of Chilean jack mackerel in the Southeastern Pacific.
26 THANK YOU Instituto de
27 CORRIENTES Y BIOMASA ACÚSTICA DE JUREL La biomasa acústica incrementa en los bordes de los remolinos ciclónicos y en corrientes de meandro fuertes. Tomado de S. Hormazábal, S. Núñez, D. Arcos, F. Gómez & G. Yuras. In press (Fish. Oceanogr.)
28 SPATIAL DISTRIBUTION OF LARVAL STAGES (Example for Nov. 2004) Vitelogenic larvae Pre-flexion larvae Post-flexion larvae
29 Huevos vs corrientes Larvas vs corrientes
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